摘要
本工作利用旋转搅拌装置,研究了两种高强钢(马氏体钢和高锰钢)在人工海水中的纯腐蚀、纯磨损和冲刷腐蚀行为,并结合电化学、失重测量和形貌表征,对两种高强钢在人工海水中局部腐蚀与磨损耦合作用机制进行了分析。实验结果表明,在纯流体下,高锰钢的腐蚀速率远低于马氏体钢,具有更好的耐蚀性。加入沙砾后,高锰钢的腐蚀形貌与纯流体中相似,均呈现点蚀坑,而马氏体钢的腐蚀形貌从“flow mark”转变为点蚀坑。在低流速下,沙砾的冲击作用较弱,两种钢的冲刷腐蚀仍以腐蚀作用为主,同时腐蚀与磨损的耦合作用非常显著,由耦合作用造成的损失是两种钢冲刷腐蚀损失的主要原因。电化学和失重测量结果显示,高锰钢的冲刷腐蚀速率要远低于马氏体钢,但是局部形貌表征结果显示高锰钢的点蚀坑深度要高于马氏体钢,面临更高的穿孔风险。此外,高锰钢点蚀坑内部的裂纹发展也可能会诱发其他类型的损伤。因此,在研究冲刷腐蚀过程中,局部冲刷腐蚀信息也应该被重点关注。
In this work,the corrosion,erosion and erosion-corrosion behaviors of two high-strength steels(martensitic steel and high manganese steel)in artificial seawater were studied by using a rotary stirring setup,and the coupling mechanism of local corrosion and erosion of two high-strength steels in artificial seawater was analyzed by combining electrochemistry,weight loss measurement and morphological characterization.The test results show that under pure fluid,high manganese steel has better corrosion-resistance,and its corrosion rate is much lower than that of martensitic steel.After the addition of sand,the corrosion morphology of high manganese steel is similar to that in pure fluids,and all of them are pitting damage,while the corrosion morphology of martensitic changes from“flow mark”to pitting damage.At a low flow rate,the impact of sand is weak,and the corrosion of the two steels is dominant in its erosion-corrosion,and the synergistic effect of corrosion and erosion is very significant,and the loss caused by the synergistic effect is the main reason for the erosion-corrosion loss of the two steels.The electrochemical and weight loss measurements show that the erosion-corrosion rate of high-manganese steel is much lower than that of martensitic steel,but the local morphology characterization results show that the pit depth of high-manganese steel is higher than that of martensitic steel,and it faces a higher risk of perforation.Furthermore,crack development inside the pit may also induce other types of damage.Therefore,in the process of studying erosion-corrosion,we should also pay attention to the local erosion-corrosion.
作者
邹晓惠
刘永飞
李丹
姚海元
董磊磊
徐云泽
ZOU Xiaohui;LIU Yongfei;LI Dan;YAO Haiyuan;DONG Leilei;XU Yunze(School of Naval Architecture,Dalian University of Technology,Dalian 116024,Liaoning,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《材料导报》
2025年第8期174-181,共8页
Materials Reports
基金
国家重点研发计划(2022YFC2806200)。
关键词
马氏体钢
高锰钢
人工海水
冲刷腐蚀
耦合作用
martensitic steel
high manganese steel
artificial seawater
erosioncorrosion
synergy
